-3-1+1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31=252
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-3-1+1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31=252
-3-1+1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31=252